Steam-turbine.



R. H. PYLE. STEAM TURBINE. APPLIOATION FILED JULY 25, 1910.

Patented Aug. 27, 1912.

' ATTORNEY.

PATH

ROBERT H. PYLE, OF INDIANAPOLIS, INDIANA, SSIGNOR, BY MESNE ASSIGNMENTS, T REMY ELECTRIC COMPANY, OF ANDERSON, INDIANA, A GORPGRAT'ION.

STEAM-TURBINE.

Specification of Letters Patent. -Patiented All" Application filed July 25, 1910. Serial 1161573544.

} influences of centrifugal forces while at high speed. To tha'i end the body of the revolv ing wheel is madeof a plate in disk form with the central portion pressed or bent so as to occupy an intermediate position in the casing, although the outer portion of the plate lies to one side of the chamber in the casing so as to carry the buckets; In other words, the wheel is mounted on the shaft with its central portion in a plane that will maintain the centrifugal balance of the wheel during the operation thereof.

Another object is to facilitate the construction of such devices.

The nature of the invention will be understood from the accompanying drawings and the following description and claim.

in the drawings Figure 1 is a side elevation of the steam turbine wheel and a transverse section through the shaft and a hub. Fig. 2 is a section on the line 2-2 of Fig. 1, but showing also a portion of the casing. .l ig. 3 a section on the line 3 of liig. 1. l ig. 1; is a perspective riew of one of the liiuckets before it is assembled with the rest of the wheel.

There is shown herein a shaft to which a. hub 11 is secured in any suitable way. in the form herein it is shrunl on the shaft and has an extended radial flange 12 to which the turbine wheel plate 13 is secured by bolts or rivets 14. The wheel operates within a fixed casing 15 which has a steam inlet port 16 and an exhaust port17. The plate 13 isa circular disk which is pressed or formed so that portions thereof lie in three planes. The inner portion 113 surrounds and is secured to the hub substantially midway between the two side walls' of the casing, and, therefore, lies in a plane substantially mid-. way between the two sides of the steam turbine 'wheel as a whole. Beyond the inner and central portion 1.13 the plate is bent iaterally to form the major portion 213 thereof which lies close to one side wall of the casing 15 and to which one set of buckets 20 are secured. The outer portion 313 of the plate 13 is again bent inwardly somewhat to a plane which lies between the planes of the I portions 111) and 213., and this outer portion carries the outer series of buckets 21. .The

buckets 20 and 21 are secured at one of their ends to the portions 213 and-313, respectively, of the. wheel 13, and at their other ends said buckets are secured respectively to the rings and 31.

The turbine wheelas awhole, therefore, may be said to consist of the hub 11, the plate 13 with its three portions 113, 213 and 313, the two rings 30 and 31, and the inter mediate buckets 20 and 21, as these are all rigidly secured together into one structure which is fixed'on the shaft 10 and revolves under the impact of the steam entering the casing 15. The plate forming the portions 113, 213, and 313 of the wheel is relatively thin so that-the wheel may be made light, and yet by securing the inner portion 113 to the shaft at a point about midway of the planes through the portions 213 of said plate and the ring 30, which are the two lateral planes of the wheel as a whole, the centrifugal force while the wheel is at high speed will not tend to unbalance the wheel with the walls of the casing. Thus, if the plate 13 were straight and secured to the. shaft near one side of the casing 15, under a high speed, the centrifugal force would throw the outer portion of the turbine wheel to the left from the position shown in Fig. 2 into engagement with the casing, and that would seriously injure the success of the device in operation and use. As it is shown in Fig. 2, the wheel as a whole will maintain its parts in the same plane under the highest speed that it does while stationary. In other words, it is so constructed and arranged that it is not caused by centrifugal force to move laterally in either direction to any extent but wilLmaintain its con L as shown in Fig. ff, consisting of a. body portion with 2). lug 22 at each end. The entire bucket may be stamped or cut out. of

a single plate, as the lugs 22 are in the same plane longitudinally as the body of the bucket. The plate 13 and the rings 30 and 31 are provided with suitable holes through them to receive the lugs 22 of the buckets, as shown in Fig. 3, and after the parts are assembled the ends of the lugs are offset so that the buckets are riveted into permanent connection with the plate and rings.

1' claim as my invention:

In a steam turbine, the combination with a casing provided at one side with inlet and exhaust ports, and a shaft associated there with, of a hub mounted upon said shaft. and provided with an attaching flange, an imperforate disk carried by said flange and arranged at the side of said casing remote from the inlet and exhaust ports, the central portion of said plate being pressed inwardly, whereby to occupy a plane at sub stantially the middle of the casing, the pe Copies of this patent may be obtained for ripheral edges of said plate occupying a plane beyond the plane occupied by said central portion, and the portion of said plate intermediate the central portion and the peripheral edges being pressed outwardly to occupy a plane beyond the plane occupied by the peripheral edges, buckets carried by the peripheral edge portions and. the portion intermediate the peripheral edge portions and the, central portion, and rings carried by the end port-ions of the buckets adjacent to the inlet and exhaust ports.

In With. sswhereof, I have hereunto aflixed my signature in the presence of the Witnesses herein named.

ROBERT H. PYLE.

Witnesses G. H. Bomn, J .I-I. WELLS.

fiv eoents each; by addressing the Commissioner of Patents, Washington. D. G.- 

